Process for the production of a multilayer vehicle repair coating

Abstract

A process for multilayer repair coating, comprising the following steps: applying a first base coat layer of a conventional, water-borne base coat I containing at least one special effect pigment, applying a second base coat layer of a water-borne base coat II onto the resultant coating, wherein the water-borne base coat II for producing the second base coat layer is feathered out into the zones bordering the repair coating, and wherein this water-borne base coat II comprises A) at least one water-dilutable binder, B) at least one special effect pigment, C) at least one matting agent, D) water and E) optionally, conventional coating additives and/or organic solvents, with the proviso that the water-borne base coat II contains the at least one special effect pigment in a quantity of 25-75 wt. %, relative to the quantity of the at least one special effect pigment contained in water-borne base coat I, applying a clear coat layer of a transparent clear coat onto the resultant coating and curing the coating applied.

1. A process for multilayer vehicle repair coating comprising the following steps:
 1. optionally, preparing a blemished area to be repaired, 
 2. applying a first base coat layer of a conventional, water-borne base coat I containing at least one special effect pigment onto the blemished area to be repaired, 
 3. applying a second base coat layer of a water-borne base coat II onto the resultant coating, wherein the water-borne base coat II for producing the second base coat layer is feathered out into the zones bordering the repair coating, and wherein this water-borne base coat II comprises
 A) at least one water-dilutable binder, 
 B) at least one special effect pigment, 
 C) at least one mailing agent, 
 D) water and 
 E) optionally, additional conventional coating additives and/or organic solvents, 
 
 
       with the proviso that the water-borne base coat II contains the at least one special effect pigment in a quantity of 25-75 wt. %, relative to the quantity of the at least one special effect pigment contained in water-borne base coat I, and wherein the water-borne base coat II obtained by mixing the water-borne base coat I and a blend-in additive contains:
 a1) at least one water-dilutable binder, 
 a2) at least one matting agent, 
 a3) water and optionally, organic solvents and/or additional conventional coating additives, 
 4. applying a clear coat layer of a transparent clear coat onto the resultant coating of water-borne base coat, and 
 5. curing the coating applied in this manner. 
 
     
     
       2. The process according to  claim 1 , wherein water-borne base coat II contains 0.01 to 3.00 wt. % of the at least one matting agent C), relative to the entire quantity of water-borne base coat II. 
     
     
       3. The process according to  claim 1 , wherein water-borne base coat II contains 0.03 to 2.00 wt. % of the at least one matting agent C), relative to the entire quantity of water-borne base coat II. 
     
     
       4. The process according to  claim 1 , wherein water-borne base coat II contains the at least one special effect pigment in a quantity of 35-85 wt. %, relative to the quantity of the at least one special effect pigment contained in water-borne base coat I. 
     
     
       5. The process according to  claim 1 , wherein water-borne base coat I comprises:
 a) at least one water-dilutable, film-forming binder, 
 b) at least one special effect pigment, 
 c) water, 
 d) optionally, conventional coating additives and/or organic solvents. 
 
     
     
       6. The process according to  claim 5 , wherein the water-dilutable binders a) comprise water-dilutable polyurethane and/or (meth)acrylate resins. 
     
     
       7. The process according to  claim 1 , wherein water-borne base coat I contains 1.0 to 13.0 wt. % of the at least one special effect pigment, relative to the complete coating composition. 
     
     
       8. The process according to  claim 1 , wherein the water-dilutable binders A) comprise water-dilutable polyurethane and/or (meth)acrylate resins. 
     
     
       9. The process according to  claim 1 , wherein the matting agents C) comprise urea/formaldehyde condensation products and/or silicon dioxide-based matting agents. 
     
     
       10. The process according to  claim 1 , wherein the matting agents a2) comprise urea/formaldehyde condensation products and/or silicon dioxide-based matting agents. 
     
     
       11. The process according to  claim 1 , wherein the water-borne base coat II is obtained by mixing water-borne base coat I and a blend-in additive, which contains
 a1) 5.00 to 40.00 wt. % of at least one water-dilutable binder, 
 a2) 0.01 to 4.00 wt. % of at least one matting agent and 
 a3) 60 to 90 wt. % of water and optionally, organic solvents and/or additional conventional coating additives, wherein the weight percentages of components a) to c) add up to 100 wt. %, 
 
       in a mixing ratio such that water-borne base coat II contains the at least one special effect pigment in a quantity of 25-75 wt. %, relative to the quantity of the at least one special effect pigment contained in water-borne base coat I. 
     
     
       12. The process according to  claim 11 , wherein the water-borne base coat II is obtained by mixing water-borne base coat II and the blend-in additive in a mixing ratio of 1:2 to 2:1, relative to weight. 
     
     
       13. The process according to  claim 1 , wherein the blend-in additive contains 5.00 to 40.00 wt. % of the at least one water-dilutable binder a1), 0.01 to 4.00 wt. % of the at least one matting agent a2), 50 to 90 wt. % of water and 0-20 wt. % of organic solvents, wherein the weight percentages of the components add up 100 wt. %. 
     
     
       14. The process according to  claim 1 , water-borne base coat II is applied in step 3 onto water-borne base coat I after a flash-off phase, without intermediate curing or intermediate drying. 
     
     
       15. The process according to  claim 1 , wherein the clear coat is applied in step 4 onto water-borne base coat II after a flash-off phase, without intermediate curing or intermediate drying. 
     
     
       16. The process according to  claim 1 , wherein the coatings applied in steps 2, 3 and 4 are jointly cured in step 5 at 20 to 80° C. 
     
     
       17. The process according to  claim 1 , wherein it comprises a vehicle repair process for blending-in.